WATCH LIVE: NYC holds 9/11 memorial service on 15th anniversary

New York City is set to hold a memorial service on Sunday morning, the 15th anniversary of 9/11.

The coordinated attacks on September 11, 2001 took the lives of 2,996 innocent people, making it the deadliest attack on American soil in history. More than 6,000 other were injured.

Nineteen terrorists hijacked 4 jetliners in the early hours. Two of the plans hit the World Trade Center towers, one stuck the Pentagon building in Washington, D.C. and one crashed in a field in Shanksville, Pennsylvania.

15 most iconic images from September 11, 2001 and aftermath

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15 most iconic images from September 11, 2001 and aftermath

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15 most iconic images from September 11, 2001 and aftermath

Content in this photo gallery may be difficult for some to see -- viewer discretion is advised.

This September 11, 2001 file photo shows US President George W. Bush interrupted by his Chief of Staff Andrew Card(L) shortly after news of the New York City airplane crashes was available in Sarasota, Florida.

(Photo by PAUL J. RICHARDS/AFP/Getty Images)

Hijacked United Airlines Flight 175 (L) flies toward the World Trade Center twin towers shortly before slamming into the south tower as the north tower burns following an earlier attack by a hijacked airliner in New York City September 11, 2001. The stunning aerial assaults on the huge commercial complex where more than 40,000 people worked on an ordinary day were part of a coordinated attack aimed at the nation's financial heart. They destroyed one of America's most dramatic symbols of power and financial strength and left New York reeling. (REUTERS/Sean Adair)

The second tower of the World Trade Center explodes into flames after being hit by a airplane, New York September 11, 2001 with the Brooklyn bridge in the foreground. Both towers of the complex collapsed after being hit by hijacked planes.

(REUTERS/Sara K. Schwittek)

Photo shows the point of impact where a plane crashed into the North tower of the World Trade Center in New York City early September 11, 2001. Three hijacked planes crashed into major U.S. landmarks on Tuesday, destroying both of New York's mighty twin towers and plunging the Pentagon in Washington into flames, in an unprecedented assault on key symbols of U.S. military and financial power.

(Jeff Christensen / Reuters)

This 11 September 2001 file photo shows Marcy Borders covered in dust as she takes refuge in an office building after one of the World Trade Center towers collapsed in New York. Borders was caught outside on the street as the cloud of smoke and dust enveloped the area.

(Photo credit STAN HONDA/AFP/Getty Images)

A true-color image taken by the Enhanced Thematic Mapper Plus (ETM+) aboard the Landsat 7 satellite on September 12, 2001 shows New York City and the smoldering World Trade Center following the September 11, 2001 attacks in this handout photo courtesy of NASA. The image was captured at roughly 11:30 a.m. Eastern Daylight Savings Time.

(REUTERS/NASA/Handout)

A person falls to their death from the World Trade Center after two planes hit the Twin Towers September 11, 2001 in New York City.

(Photo by Jose Jimenez/Primera Hora/Getty Images)

The south tower of the World Trade Center collapses September 11, 2001 in New York City.

(Thomas Nilsson/ Getty Images)

This 11 September 2001 file photo shows pedestrians running from the scene as one of the World Trade Center towers collapses in New York City following a terrorist plane crash on the twin towers.

(DOUG KANTER/AFP/Getty Images)

Rescue operations at Ground Zero; Firefighters finding victims and searching for survivors at the wreckage of the World Trade Center Towers following Tuesday's Terrorist attack in New York, United states on September 14, 2001.

(Photo by Graham MORRISON/Gamma-Rapho via Getty Images)

Rescue workers carry fatally injured New York City Fire Depatment Chaplain, Father Mychal Judge, from one of the World Trade Center towers in New York City, early September 11, 2001. Both towers were hit by planes crashing into the buildings and collapsed a short time later.

(REUTERS/Shannon Stapleton)

The damaged area of the Pentagon building, where a hijacked commercial jetliner slammed into it September 11, 2001, is seen in this file photo with the U.S. Capitol Building in the background, at sunrise on September 16, 2001.

(REUTERS/Larry Downing)

Firefighters raise a U.S. flag at the site of the World Trade Center after two hijacked commercial airliners were flown into the buildings September 11, 2001 in New York.

(Photo by 2001 The Record (Bergen Co. NJ)/Getty Images)

A New York City fireman calls for more rescue workers to make their way into the rubble of the World Trade Center September 15, 2001.

Members of the New York Fire and Police Departments salute as a truck carrying the last steel column of the World Trade Center moves up West Street from inside of the World Trade Center site May 30, 2002 as the recovery effort at Ground Zero officially ends in New York.

(Photo by Spencer Platt/Getty Images)

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During New York City's memorial service, the first bells will ring at Ground Zero at 8:46 a.m. ET to commemorate Flight 11 hitting the North Tower. Bells will ring again at 9:03 a.m. ET to commemorate Flight 175 hitting the South Tower. At 10:28 a.m. ET bells are scheduled to ring to commemorate the North Tower collapsing.

Names of all the victims will be read aloud at the solemn service in lower Manhattan.

Photos of 9/11 memorials at the Pentagon, in Shanksville, Penn., and elsewhere

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9/11 memorials at the Pentagon, in Shanksville, Penn., and elsewhere

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9/11 memorials at the Pentagon, in Shanksville, Penn., and elsewhere

A woman sits amongst U.S. Army honor guard members at the Pentagon 9/11 Memorial in Washington September 11, 2015. An overcast Friday greeted relatives who gathered to commemorate nearly 3,000 people killed in the September 11 attacks in New York, Pennsylvania and outside Washington 14 years ago, when airliners hijacked by al Qaeda militants brought death, mayhem and destruction. REUTERS/Gary Cameron

A United States flag is unfurled at sunrise at the Pentagon on the 14th anniversary of the 9/11 attacks, in Washington September 11, 2015. Relatives of the nearly 3,000 people killed in the Sept. 11, 2001, attacks are due to gather in New York, Pennsylvania and outside Washington on Friday to mark the 14th anniversary of the hijacked airliner strikes carried out by al Qaeda militants. REUTERS/Gary Cameron

A man walks through the 9/11 Empty Sky memorial at sunrise across from New York's Lower Manhattan and One World Trade Center in Liberty State Park in Jersey City, New Jersey, September 11, 2013. Americans will commemorate the 12th anniversary of the September 11 attacks with solemn ceremonies and pledges to not forget the nearly 3,000 killed when hijacked jetliners crashed into the World Trade Center, the Pentagon, and a Pennsylvania field. REUTERS/Gary Hershorn (UNITED STATES - Tags: CITYSCAPE DISASTER ANNIVERSARY TPX IMAGES OF THE DAY)

An unidentified couple sit on a bench during a memorial service on the 11th anniversary of the attacks of September 11, 2001 to honor the 184 people who lost their lives when American Airlines flt. 77 crashed into the Pentagon, outside Washington, September 11, 2012. REUTERS/Larry Downing (UNITED STATES - Tags: DISASTER ANNIVERSARY POLITICS)

A sign shows the date of the September 11, 2001 attacks, at the Pentagon Memorial near Washington June 28, 2011. The tenth anniversary of the September 11, 2001 attacks will be commemorated this year.REUTERS/Jason Reed (UNITED STATES - Tags: DISASTER ANNIVERSARY)

SHANKSVILLE, PA - AUGUST 19: Trees planted throughout the grounds the Flight 93 National Memorial in Shanksville, Pennsylvania on August 19, 2016. American Airlines Flight 93 crashed into a field outside Shanksville, PA with 33 passengers, seven crew members, and four hijackers aboard on September 11, 2001. (Photo by Jeff Swensen/Getty Images)

SHANKSVILLE, PA- SEPTEMBER 11:Guests visit the Flight 93 National Memorial during the 14th anniversary of the 9/11 attack in Shanksville, Pennsylvania. Homeland Security Secretary Jeh Johnson and other dignitaries spoke at the occasion and layed a wreath at the memorial. Today marks the 14th anniversary of the attacks where nearly 3,000 people were killed in New York, Washington D.C. and Pennsylvania. (Photo by Jeff Swensen/Getty Images)

SHANKSVILLE, PA- SEPT 09: The new visitor center features dramatic concrete walls that follow the path of the doomed Flight 93. Over the edge (past where the people can be seen in the photo) is the wall of names area and the crash impact site. Thursday September 10, 2015 is the official opening for the new Visitor Center at the Flight 93 National Memorial. These photos were taken during a preview on September 9, 2015. The new visitor center has extensive displays that walks attendees through the events that occurred in Shanksville, Pa. on 9/11. (Michael S. Williamson/The Washington Post via Getty Images)

SHANKSVILLE, PA- SEPT 09: When one tours the new visitor center there is a timeline of the terrible events of the day etched in the walkway leading to a view of the Flight 93 impact site. Thursday September 10, 2015 is the official opening for the new Visitor Center at the Flight 93 National Memorial. These photos were taken during a preview on September 9, 2015. The new visitor center has extensive displays that walks attendees through the events that occurred in Shanksville, Pa. on 9/11. (Michael S. Williamson/The Washington Post via Getty Images)

JERSEY CITY, NJ - SEPTEMBER 10: A color guard stands inside the Empty Sky Memorial structure during the structure's dedication at Liberty State Park on September 10, 2011 in Jersey City, New Jersey. Empty Sky Memorial consists of two 30 foot tall concrete and steel structures, inscribed with the 746 names of victims who lived in New Jersey and were killed during the terrorist attacks of September 11, 2001. (Photo by Andrew Burton/Getty Images)

BAYONNE, NJ - SEPTEMBER 11: Catholic War Veterans of Bayonne Sam Capodice (L-R) Robert Bell, and Mike Capodice, check out the monument To The Struggle Against World Terrorism on the fifth anniversary of 9/11 terrorist attacks after dedication ceremony September 11, 2006 in Bayonne, New Jersey. To The Struggle Against World Terrorism memorial is a gift from Russian President Vladimir Putin, the People of Russia and sculptur Zurab Tsereteli to the people of the United States. (Photo by Sylwia Kapuscinski/Getty Images)